Physics – Quantum Physics
Scientific paper
2007-07-04
Science 317, 1893-1896 (2007).
Physics
Quantum Physics
About 12 pages, 5 figures
Scientific paper
10.1126/science.1145699
A major goal of developing high-precision control of many-body quantum systems is to realise their potential as quantum computers. Probably the most significant obstacle in this direction is the problem of "decoherence": the extreme fragility of quantum systems to environmental noise and other control limitations. The theory of fault-tolerant quantum error correction has shown that quantum computation is possible even in the presence of decoherence provided that the noise affecting the quantum system satisfies certain well-defined theoretical conditions. However, existing methods for noise characterisation have become intractable already for the systems that are controlled in today's labs. In this paper we introduce a technique based on symmetrisation that enables direct experimental characterisation of key properties of the decoherence affecting a multi-body quantum system. Our method reduces the number of experiments required by existing methods from exponential to polynomial in the number of subsystems. We demonstrate the application of this technique to the optimisation of control over nuclear spins in the solid state.
Baugh Jonathan
Cory David G.
Emerson Joseph
Laflamme Raymond
Laforest Martin
No associations
LandOfFree
Symmetrised Characterisation of Noisy Quantum Processes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Symmetrised Characterisation of Noisy Quantum Processes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Symmetrised Characterisation of Noisy Quantum Processes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-548028